code: def _test_chunked_stream(self, data, py_buf_size):
      # write data using the chunked protocol from python.
      chunked_file = tempfile.NamedTemporaryFile(delete=False)
      dechunked_file = tempfile.NamedTemporaryFile(delete=False)
      dechunked_file.close()
      try:
          out = ChunkedStream(chunked_file, py_buf_size)
          out.write(data)
          out.close()
          # now try to read it in java
          jin = self._jvm.java.io.FileInputStream(chunked_file.name)
          jout = self._jvm.java.io.FileOutputStream(dechunked_file.name)
          self._jvm.DechunkedInputStream.dechunkAndCopyToOutput(
              jin, jout
          )
          # java should have decoded it back to the original data
          self.assertEqual(
              len(data), os.stat(dechunked_file.name).st_size
          )
          with open(dechunked_file.name, "rb") as f:
              byte = f.read(1)
              idx = 0
              while byte:
                  self.assertEqual(
                      data[idx],
                      bytearray(byte)[0],
                      msg="idx = " + str(idx),
                  )
                  byte = f.read(1)
                  idx += 1
      finally:
          os.unlink(chunked_file.name)
          os.unlink(dechunked_file.name)
  
imports: import os
  import pickle
  import random
  import time
  import tempfile
  import unittest
  from py4j.protocol import Py4JJavaError
  from pyspark import SparkConf, SparkContext, Broadcast
  from pyspark.java_gateway import launch_gateway
  from pyspark.serializers import ChunkedStream
  from pyspark.sql import SparkSession, Row
label_desc: Use image node_id 2 for calling the BroadcastFrameProtocolTest obj's underlying member method code with example usage: obj._test_chunked_stream(data, py_buf_size) without return types